Annotation of src/usr.bin/chpass/chpass.c, Revision 1.13
1.12 millert 1: /* $OpenBSD: chpass.c,v 1.11 1998/05/29 16:37:51 millert Exp $ */
1.2 deraadt 2: /* $NetBSD: chpass.c,v 1.8 1996/05/15 21:50:43 jtc Exp $ */
1.1 deraadt 3:
4: /*-
5: * Copyright (c) 1988, 1993, 1994
6: * The Regents of the University of California. All rights reserved.
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
16: * 3. All advertising materials mentioning features or use of this software
17: * must display the following acknowledgement:
18: * This product includes software developed by the University of
19: * California, Berkeley and its contributors.
20: * 4. Neither the name of the University nor the names of its contributors
21: * may be used to endorse or promote products derived from this software
22: * without specific prior written permission.
23: *
24: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34: * SUCH DAMAGE.
35: */
36:
37: #ifndef lint
38: static char copyright[] =
39: "@(#) Copyright (c) 1988, 1993, 1994\n\
40: The Regents of the University of California. All rights reserved.\n";
41: #endif /* not lint */
42:
43: #ifndef lint
44: #if 0
45: static char sccsid[] = "@(#)chpass.c 8.4 (Berkeley) 4/2/94";
46: #else
1.12 millert 47: static char rcsid[] = "$OpenBSD: chpass.c,v 1.11 1998/05/29 16:37:51 millert Exp $";
1.1 deraadt 48: #endif
49: #endif /* not lint */
50:
51: #include <sys/param.h>
52: #include <sys/stat.h>
53: #include <sys/time.h>
54: #include <sys/resource.h>
55:
56: #include <ctype.h>
57: #include <err.h>
58: #include <errno.h>
59: #include <fcntl.h>
60: #include <pwd.h>
61: #include <stdio.h>
62: #include <stdlib.h>
63: #include <string.h>
64: #include <unistd.h>
1.2 deraadt 65: #include <util.h>
1.1 deraadt 66:
67: #include "chpass.h"
68: #include "pathnames.h"
69:
70: char *tempname;
71: uid_t uid;
72:
1.13 ! millert 73: extern char *__progname;
! 74:
1.1 deraadt 75: #ifdef YP
76: int use_yp;
77: int force_yp = 0;
78: extern struct passwd *ypgetpwnam(), *ypgetpwuid();
1.10 deraadt 79: int _yp_check __P((char **));
80: int pw_yp __P((struct passwd *, uid_t));
1.1 deraadt 81: #endif
82:
83: void baduser __P((void));
84: void usage __P((void));
85:
86: int
87: main(argc, argv)
88: int argc;
89: char **argv;
90: {
91: enum { NEWSH, LOADENTRY, EDITENTRY } op;
92: struct passwd *pw, lpw;
1.2 deraadt 93: int ch, pfd, tfd, dfd;
1.11 millert 94: char *arg, tempname[] = __CONCAT(_PATH_VARTMP,"pw.XXXXXXXX");
1.1 deraadt 95:
96: #ifdef YP
97: use_yp = _yp_check(NULL);
98: #endif
99:
100: op = EDITENTRY;
1.7 millert 101: while ((ch = getopt(argc, argv, "a:s:ly")) != -1)
1.1 deraadt 102: switch(ch) {
103: case 'a':
104: op = LOADENTRY;
105: arg = optarg;
106: break;
107: case 's':
108: op = NEWSH;
109: arg = optarg;
110: break;
111: #ifdef YP
112: case 'l':
113: use_yp = 0;
114: break;
115: case 'y':
116: if (!use_yp) {
117: warnx("YP not in use.");
118: usage();
119: }
120: force_yp = 1;
121: break;
122: #endif
123: case '?':
124: default:
125: usage();
126: }
127: argc -= optind;
128: argv += optind;
129:
130: #ifdef YP
131: if (op == LOADENTRY && use_yp)
132: errx(1, "cannot load entry using NIS.\n\tUse the -l flag to load local.");
133: #endif
134: uid = getuid();
135:
136: if (op == EDITENTRY || op == NEWSH)
137: switch(argc) {
138: case 0:
139: pw = getpwuid(uid);
140: #ifdef YP
141: if (pw && !force_yp)
142: use_yp = 0;
143: else if (use_yp)
144: pw = ypgetpwuid(uid);
145: #endif /* YP */
146: if (!pw)
147: errx(1, "unknown user: uid %u\n", uid);
148: break;
149: case 1:
150: pw = getpwnam(*argv);
151: #ifdef YP
152: if (pw && !force_yp)
153: use_yp = 0;
154: else if (use_yp)
155: pw = ypgetpwnam(*argv);
156: #endif /* YP */
157: if (!pw)
158: errx(1, "unknown user: %s", *argv);
159: if (uid && uid != pw->pw_uid)
160: baduser();
161: break;
162: default:
163: usage();
164: }
165:
166: if (op == NEWSH) {
167: /* protect p_shell -- it thinks NULL is /bin/sh */
168: if (!arg[0])
169: usage();
1.9 kstailey 170: if (p_shell(arg, pw, NULL))
171: pw_error(NULL, 0, 1);
1.1 deraadt 172: }
173:
174: if (op == LOADENTRY) {
175: if (uid)
176: baduser();
177: pw = &lpw;
1.9 kstailey 178: if (!pw_scan(arg, pw, NULL))
1.1 deraadt 179: exit(1);
180: }
181:
1.2 deraadt 182: /* Get the passwd lock file and open the passwd file for reading. */
1.1 deraadt 183: pw_init();
1.2 deraadt 184: tfd = pw_lock(0);
1.12 millert 185: if (tfd == -1 || fcntl(tfd, F_SETFD, 1) == -1) {
1.6 millert 186: if (errno == EEXIST)
187: errx(1, "the passwd file is busy.");
188: else
189: err(1, "can't open passwd temp file");
190: }
1.2 deraadt 191: pfd = open(_PATH_MASTERPASSWD, O_RDONLY, 0);
1.12 millert 192: if (pfd == -1 || fcntl(pfd, F_SETFD, 1) == -1)
1.2 deraadt 193: pw_error(_PATH_MASTERPASSWD, 1, 1);
1.1 deraadt 194:
1.2 deraadt 195: /* Edit the user passwd information if requested. */
1.1 deraadt 196: if (op == EDITENTRY) {
1.2 deraadt 197: dfd = mkstemp(tempname);
1.12 millert 198: if (dfd == -1 || fcntl(dfd, F_SETFD, 1) == -1)
1.2 deraadt 199: pw_error(tempname, 1, 1);
200: display(tempname, dfd, pw);
201: edit(tempname, pw);
1.1 deraadt 202: (void)unlink(tempname);
203: }
1.2 deraadt 204:
1.1 deraadt 205: #ifdef YP
206: if (use_yp) {
1.4 deraadt 207: if (pw_yp(pw, uid)) {
1.9 kstailey 208: pw_error(NULL, 0, 1);
1.4 deraadt 209: exit(1);
1.5 deraadt 210: } else {
211: pw_abort();
1.1 deraadt 212: exit(0);
1.5 deraadt 213: }
1.4 deraadt 214: } else
1.1 deraadt 215: #endif /* YP */
1.8 deraadt 216: {
217: /* Copy the passwd file to the lock file, updating pw. */
218: pw_copy(pfd, tfd, pw);
1.2 deraadt 219:
1.8 deraadt 220: /* Now finish the passwd file update. */
1.12 millert 221: if (pw_mkdb() == -1)
1.9 kstailey 222: pw_error(NULL, 0, 1);
1.8 deraadt 223: }
1.1 deraadt 224:
225: exit(0);
226: }
227:
228: void
229: baduser()
230: {
231:
232: errx(1, "%s", strerror(EACCES));
233: }
234:
235: void
236: usage()
237: {
238:
239: #ifdef YP
1.13 ! millert 240: (void)fprintf(stderr, "usage: %s [-a list] [-s shell] [-l]%s [user]\n",
! 241: __progname, use_yp?" [-y]":"");
1.1 deraadt 242: #else
1.13 ! millert 243: (void)fprintf(stderr, "usage: %s [-a list] [-s shell] [user]\n",
! 244: __progname);
1.1 deraadt 245: #endif
246: exit(1);
247: }
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